package com.itheima.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.common.R;
import com.itheima.entity.Employee;
import com.itheima.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.time.LocalDateTime;

@Slf4j
//@RestController注解相当于
// @ResponseBody ＋ @Controller合在一起的作用。返回json数据不需要在方法前面加@ResponseBody注解了
@RestController
@RequestMapping("/employee")
public class EmployeeController {
    @Autowired
    private EmployeeService employeeService;

    @PostMapping("/login")
    public R<Employee> login(HttpServletRequest req, @RequestBody Employee employee) {
        /*
        ①. 将页面提交的密码password进行md5加密处理, 得到加密后的字符串
        ②. 根据页面提交的用户名username查询数据库中员工数据信息
        ③. 如果没有查询到, 则返回登录失败结果
        ④. 密码比对，如果不一致, 则返回登录失败结果
        ⑤. 查看员工状态，如果为已禁用状态，则返回员工已禁用结果
        ⑥. 登录成功，将员工id存入Session, 并返回登录成功结果
         */
        String password = employee.getPassword();
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        LambdaQueryWrapper<Employee> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Employee::getUsername, employee.getUsername());
        Employee emp = employeeService.getOne(queryWrapper);

        if (emp == null) {
            return R.error("登录失败");
        }

        if (!emp.getPassword().equals(password)) {
            return R.error("登录失败");
        }

        if (emp.getStatus() == 0) {
            return R.error("账号已禁用");
        }
        req.getSession().setAttribute("employee", emp.getId());
        return R.success(emp);
    }

    @PostMapping("/logout")
    public R<String> logout(HttpServletRequest req) {
        req.getSession().removeAttribute("employee");
        return R.success("退出成功");
    }

    @PostMapping
    public R<String> save(HttpServletRequest req, @RequestBody Employee employee) {
        log.info("新增员工，员工信息：{}", employee.toString());

        //设置初始密码123456，需要进行md5加密处理
        employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));

        /*employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());

        //获得当前登录用户的id
        Long empId = (Long) req.getSession().getAttribute("employee");

        employee.setCreateUser(empId);
        employee.setUpdateUser(empId);*/

        employeeService.save(employee);
        return R.success("新增员工成功");
    }

    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {
        /*
        A. 构造分页条件
        B. 构建搜索条件 - name进行模糊匹配
        C. 构建排序条件 - 更新时间倒序排序
        D. 执行查询
        E. 组装结果并返回
         */
        log.info("page = {},pageSize = {},name = {}", page, pageSize, name);
        //构造分页构造器
        Page<Employee> pageInfo = new Page(page, pageSize);

        //构造条件构造器
        LambdaQueryWrapper<Employee> lqw = new LambdaQueryWrapper<>();
        //添加过滤条件
        lqw.like(StringUtils.isNotEmpty(name), Employee::getName, name);
        //添加排序条件
        lqw.orderByDesc(Employee::getUpdateTime);
        //执行查询
        employeeService.page(pageInfo, lqw);
        return R.success(pageInfo);
    }

    /**
     * 根据id查询员工信息
     *
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<Employee> getById(@PathVariable Long id) {
        log.info("根据id查询员工信息...");
        Employee employee = employeeService.getById(id);
        if (employee != null) {
            return R.success(employee);
        }
        return R.error("没有查询到对应员工信息");
    }

    @PutMapping
    public R<String> update(HttpServletRequest req, @RequestBody Employee employee) {
        /*
        1). 页面发送ajax请求，将参数(id、status)提交到服务端
        2). 服务端Controller接收页面提交的数据并调用Service更新数据
        3). Service调用Mapper操作数据库
         */
        log.info(employee.toString());

        /*long empId = (long) req.getSession().getAttribute("employee");

        employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(empId);*/

        employeeService.updateById(employee);

        return R.success("员工信息修改成功");
    }
}
